Like the ones that come with some multi-tools, where can you buy them separately?

Why not just buy the allen key?

It would have a wall thickness of <0.5mm, sounds unlikely to me.

If you mean the 8mm adapters, I've never seen them sold seperately.

It would have a wall thickness of <0.5mm, sounds unlikely to me.

No it wouldn't, it would look something like the one on this multi-tool (which I think is 5mm stepped down to 4mm, the description is unclear):

6mm minus 5mm = 1mm, divided by 2 because it fits over the smaller key, and with a tiny bit less for a clearance fit = <0.5mm.

That one in the pic is 8mm on a 5mm key.

Thanks for the maths lesson. I was wrong about the pictured one, but it's not inconceivable to have a 5mm socket in one end of say a 10mm bar, with a 6mm hex sticking out the other end of the bar now is it. But I guess no-one makes one! Have a nice day.

Here an adapter that takes 6mm to 8mm, that's the kind of thing I'm after…

Good luck.

What you want there, I believe, is a 6mm Allen key.

That, and an attitude check.

Very helpful, thanks for taking the time to post. 😉

No offence meant Johnners, hope you have a thicker skin than Cougar 🙂

Since pretty much every multi-tool or common allen key set has a 6mm, I think you may be looking for a solution to a none problem.

you could always get two 3mm allen keys and stick them together?

😆

Love it!

actually, you'd need 3 3mm hex keys to make a 6mm.

onza that depends what you use them for